Question

我在这项任务的最后一部分，任何帮助都会非常感谢你！

exec DeleteRecordWithUserInputCompanyName 'Costco'

它会说Command（s）已成功完成，但行未被删除。

任务存储过程，允许在给定公司名称作为输入的情况下删除客户。不要留下任何“孤儿”记录！

我的代码

Create Procedure DeleteRecordWithUserInputCompanyName @CompanyName varchar(50)as
--Get All Company names
Declare @@CompanyNames varchar(50)
select @@CompanyNames = Company from Customers
--Get CustomerNumber mathing the company name
Declare @@CustomerNumber char(4)
select @@CustomerNumber = CustomerNo from Customers where Company = @CompanyName
--Get Order Number mathing Customer Number
Declare @@OrderNumber int
select @@OrderNumber = OrderNo from Orders where CustomerNo = @@CustomerNumber
if (@@CompanyNames = @CompanyName)
Begin
ALTER TABLE Customers NOCHECK CONSTRAINT ALL
Delete from Customers where Company = @CompanyName
ALTER TABLE Customers CHECK CONSTRAINT ALL
Delete from Orders where CustomerNo = @@CustomerNumber
ALTER TABLE SalesDetail NOCHECK CONSTRAINT ALL  
Delete from SalesDetail where OrderNo = @@OrderNumber
ALTER TABLE SalesDetail CHECK CONSTRAINT ALL  
End

表

Create Table Customers
(
CustomerNo char(4) 
Constraint ck_CustomerNoHas4positionsWithNumbers
Check(CustomerNo like'[0-9],[0-9],[0-9],[0-9]'),
Company varchar(50) not null,
CustomerRep char(3),
CreditLimt money default(20000.00),
PRIMARY KEY(CustomerNo)
)

Create Table Orders
(
OrderNo int,
OrderDate Date not null,
CustomerNo char(4) not null,
SalesRep char(3) not null
PRIMARY KEY(OrderNo)
)

Create Table SalesDetail
(
SaleDetailID int,
ManufactureID char(3) Constraint ck_ManufactureIDFromSaleDetails check(ManufactureID like'[a-z],[a-z],[a-z]') not null,
ProductID char(5) Constraint ck_ProductIDSalesDetail check(ProductID like'[0-9],[0-9],[a-z],[a-z],[a-z]') not null,
OrderNo int,
qtyOrdered int
PRIMARY KEY(SaleDetailID)
)

Answer 1

select @@CompanyNames = Company from Customers

在此查询之后@@CompanyNames将最后一个公司保留在表客户中，因为if条件返回false，因此内部块不会被执行试试这个

Create Procedure DeleteRecordWithUserInputCompanyName @CompanyName varchar(50)as

Begin

--Delete Sale Detail First
Delete from SalesDetail where orderno in (select OrderNo from Orders where 
CustomerNo in (select CustomerNo from Customer where Company=@CompanyName))

--Delete From Orders Table
Delete from Orders where CustomerNo in (select CustomerNo from Customer where Company=@CompanyName)

--Delete Customers of that Company
Delete from Customer where Company=@companyName

End

存储过程使用用户输入删除记录（来自父表和子表）

1 个答案: